Wall sconce



FIG. 1 is a top perspective view of a wall sconce showing our new design;

FIG. 2 is a bottom, side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a wall sconce, as shown and described. 